You can associate soffits with other elements, such as walls and a roof. If a wall or roof changes or moves, the soffit adjusts accordingly.
You can also create soffits that are not associated with other elements. To create non-associative soffits, use the Lines tool while in sketch mode.
Create a sloping soffit by drawing a slope arrow or changing properties of the boundary line. See Sloped Surfaces.
 Build panel
Build panel Roof drop-down
Roof drop-down
 (Roof: Soffit).
 (Roof: Soffit). 
 Draw panel
Draw panel
 (Pick Roof Edges).
 (Pick Roof Edges). 
  This tool creates a locked sketch line.
 Draw panel
Draw panel
 (Pick Walls), highlight the outside faces of the wall beneath the roof, and click to select.
 (Pick Walls), highlight the outside faces of the wall beneath the roof, and click to select. 
 (Finish Edit Mode).
 (Finish Edit Mode). 
  To see the soffit better, create a section view through the plan view that shows the wall meeting the roof.
